By Mary Drew at Pasty Central (Mdrew) on Friday, June 11, 2021 - 07:37 pm:
Beth Jukuri is always off on some type of adventure and usually brings back some interesting finds. She was recently on the trails at McLain State Park and stopped to do some rockhounding. She said she had never seen the “Omar” rocks so plentiful before and lined them all up for a photo shoot on the shores of Lake Superior.
Information from Wikipedia, explaining what an Omar is:
Omarolluks, sometimes shortened to omars, are a distinctive type of glacial erratic that consists of dark siliceous greywacke and exhibits prominent rounded, often deep, hemispherical voids and pits. The hemispherical voids and pits result from the selective dissolution of carbonate concretions within the greywacke. Glaciers moved omars from the southeastern part of Hudson Bay to central Canada and into the U.S. where they were deposited on moraines. Because scientists know precisely where they came from they are very valuable in documenting the movement of glaciers.
Interesting how they can tell where they’ve come from like that. When rockhounding myself, I have not found any omars, probably because I’m usually focused on finding agates.
We get to learn about a number of different types of Lake Superior rocks in today’s video, including Omars.
